枯竭型酸性气藏封存CO_(2)过程中的油管腐蚀行为及选材  

Tubing corrosion behavior and material selection during CO_(2) storage in depleted acidic gas reservoir

作　　者：刘祥康 张林 曹思瑞 徐波 李玉飞 曾德智[2,3] LIU Xiangkang;ZHANG Lin;CAO Sirui;XU Bo;LI Yufei;ZENG Dezhi(Engineering Technology Research Institute of PetroChina Southwest Oil&Gas Field Company,Chengdu 610031,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China)

机构地区：[1]中国石油西南油气田公司工程技术研究院,四川成都610031 [2]西南石油大学石油与天然气工程学院,四川成都610500 [3]油气藏地质及开发工程全国重点实验室,四川成都610500

出　　处：《大庆石油地质与开发》2024年第1期102-111,共10页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“静载、振动与腐蚀作用下H2S/CO_(2)气井完井管柱螺纹密封面的力化学损伤机制研究”(51774249)。

摘　　要：为了研究不同材质油管钢在枯竭型酸性油气藏CO_(2)封存工况下的腐蚀行为,优选出适用性好的钢材,采用高温高压釜模拟CO_(2)封存工况,在不同CO_(2)分压(5、8、11 MPa)条件下,对N80钢、L80-13Cr钢和BG2532钢进行腐蚀失重测试,从腐蚀速率、腐蚀产物微观形貌和局部腐蚀深度进行研究,并对油管进行腐蚀寿命预测。结果表明:在模拟工况下N80钢、L80-13Cr钢和BG2532钢的腐蚀速率都随着CO_(2)分压的升高而增大,N80钢腐蚀速率为0.0674~0.0979 mm/a,L80-13Cr钢腐蚀速率为0.0227~0.0277 mm/a,BG2532钢腐蚀速率为0.0013~0.0029 mm/a;3种钢材的腐蚀产物主要为立方体状的FeCO3和少量的FeS,且随分压的升高,腐蚀产物逐渐增多并出现融合现象;N80钢主要表现为均匀腐蚀,而L80-13Cr钢出现点蚀,穿孔年限为5 a左右;N80钢的剩余抗拉强度和抗拉安全系数随服役年限的增长而降低,安全服役年限为27 a。研究成果为枯竭型酸性油气藏CO_(2)封存井油管选材提供依据。In order to study corrosion behavior of tubing steel of different materials in CO_(2) storage condition of de⁃pleted acidic oil and gas reservoirs,and to select suitable steel,high temperature autoclave is used to simulate CO_(2) storage condition.Corrosion weight loss is tested for N80 steel,L80-13Cr steel and BG2532 steel at different CO_(2) partial pressure(5,8 and 11 MPa),studying corrosion rate,micro-morphology of corrosion products and local cor⁃rosion depth,and predicting corrosion life of tubing.The results show that,in simulated condition,corrosion rates of N80 steel,L80-13Cr steel and BG2532 steel increase with the increase of partial pressure of CO_(2).Corrosion rate of N80 steel is 0.0674~0.0979 mm/a,corrosion rate of L80-13Cr steel is 0.0227~0.0277 mm/a,and BG2532steel corrosion rate is 0.0013~0.0029 mm/a.Corrosion products of the 3 kinds of steel are mainly cube-shaped FeCO3 and a small amount of FeS,and corrosion products gradually increase and fusion phenomenon occurs with in⁃crease of partial pressure.N80 steel mainly appears as uniform corrosion,while L80-13Cr steel shows pitting corro⁃sion,with corrosion perforation life about 5 a.Residual tensile strength and tensile safety factor of N80 steel de⁃crease with increase of service life,and safe service life is about 27 a.The research provides basis for tubing materi⁃als selection for CO_(2) sequestration wells in depleted acidic reservoirs.

关 键 词：油管腐蚀 枯竭型酸性油气藏 CO_(2)封存 腐蚀速率 局部腐蚀 寿命预测 

分 类 号：TE983[石油与天然气工程—石油机械设备]